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  1. The fourth proportional to 5, 8, 15 is:
    2. A.
    18
    B.
    24
    C.
    19
    D.
    20
    E.
    21

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    Answer : Option B

    Explanation :

    Let the fourth proportional to 5, 8, 15 be x.

    Then, 5:8 :: 15:x

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